Details are still emerging about the secret arrest of Harold T. Martin III, a former National Security Agency contractor. The F.B.I. is investigating whether he stole and disclosed classified computer code that is used to hack into the networks of foreign governments.

Image

Adm. Michael Rogers, the National Security Agency director, was brought in to restore the agency’s credibility and open it to more scrutiny.CreditJim Wilson/The New York Times

Mr. Martin, 51, a Navy veteran, was arrested in August and is in federal custody. Like Edward J. Snowden, he was also a contractor for the consulting firm Booz Allen Hamilton.

“Has he made attempts to hand over the information and chickened out, or is he a collector of information and never intended to do anything with it?” asked a senior Obama administration official. “There are a ton of what-ifs at this point.”

• On the campaign trail.

The debate on Sunday between Hillary Clinton and Donald J. Trump could determine whether Republicans trying to maintain control of Congress try to distance themselves from Mr. Trump’s campaign. Recent polls have shown him slipping in some swing states.

Image

Should Donald J. Trump falter badly in his second debate with Hillary Clinton, Republican congressional candidates may take it as a cue to flee openly from their nominee, said two senior Republicans.CreditStephen Crowley/The New York Times

After revelations that Mr. Trump declared an operating loss of more than $900 million in 1995, we reviewed roughly 60 business ventures started or promoted by Mr. Trump in the years since. A third did not work out, a third had some success and some problems, and a third met expectations.

• Hurricane nears U.S.

After pummeling Haiti this week, the storm is expected to remain at Category 3 or higher when it hits southern Florida late Thursday, and Georgia by late Friday. The governors of those states have already declared emergencies, as have South Carolina and North Carolina.

Those were the words of Aris Messinis, a photographer aboard a rescue boat in the Mediterranean this week who witnessed the dramatic rescue of hundreds of migrants. His powerful photographs capture the daily struggle migrants face trying to reach Europe.

• Nobel Prizes.

The Nobel Peace Prize will be announced on Friday morning. We don’t know who’ll receive it this year, but here’s a quiz to test your knowledge of past recipients.

Business

• Yahoo aided a U.S. email surveillance program, according to several sources. They say the company used a system built to scan emails for spam, child pornography and malware to search for a terrorist organization’s “signature” in an effort to satisfy a secret court order.

Noteworthy

• Disputes over museums.

The permanent opening of a museum dedicated to Prince’s music, to be housed at his recording lair, Paisley Park in Chanhassen, Minn., may be delayed for months because of a zoning vote. But some lucky fans will be able to tour the studio this week.

Image

The Canadian Museum for Human Rights in Winnipeg, Manitoba. It is the brainchild of a media magnate who was inspired by the United States Holocaust Memorial Museum in Washington, D.C.CreditAaron Vincent Elkaim for The New York Times

And in Winnipeg, Manitoba, the Canadian Museum for Human Rights has been criticized by members of some indigenous groups who say it could do more to address the oppression they have faced from the government. “It’s the Great Canadian Myth on display,” one activist said.

At a German-heritage celebration in 1890 in Baltimore, a speaker announced that “all of us, foreign and native-born citizens, belong to the great republican family of the New World, and are all inspired by the same love, attachment, and fidelity for our country.”

Angry mobs turned on residents with German roots. Some were accused of being spies. Books by German authors were banned, and sheets of music by composers including Beethoven were burned. Sauerkraut was temporarily called “liberty cabbage.”

German identity began to come with a degree of shame, and many people changed their names. The stigma continued during and after World War II.